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[Program Service | Recent programs]

ESTS0648 HTRATE. (Abstract last modified 06-APR-2001)


HTRATE, Power Plant Heat Rate Improvement from Condenser Retubing

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION OF PROGRAM - HTRATE. 


2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name         Package-ID  Status
HTRATE               ESTS0648/01 Arrived

Machines used:
Package-ID     Orig.Computer                       Test Computer
ESTS0648/01    IBM PC                              

3. DESCRIPTION OF PROGRAM OR FUNCTION - A utility will only retube a 
condenser with enhanced tubes if the incremental cost of the enhanced tubes can be offset with reduced fuel costs. The reduced fuel cost is obtained for some units because of the higher heat-transfer coefficient of enhanced tubes. They lead to improved condenser performance measured by a lower condenser pressure and therefore a more efficient power plant. However, the higher heat-transfer coefficients do not always guarantee that enhanced tubes will be more cost effective. Other issues must be considered such as the cooling-water flow reduction due to the increased pressure drop, the low-pressure turbine heat-rate variation with backpressure, and the cooling-water pump and system characteristics. These and other parameters must be considered to calculate the efficiency improvement of the power plant as commonly measured by the quantity known as the heat rate. Knowing the heat-rate improvement, the fuel cost, and the incremental increase of the enhanced tubes from the supplier, the payback time can be determined. This program calculates the heat-rate improvement that can be obtained by retubing a power plant condenser with enhanced tubes of a particular type called Korodense LPD made by Wolverine Tube, Inc. The fuel savings are easily established knowing the heat-rate improvement. All electrical utilities are potential users because a condenser is used as the heat sink for every power plant.


4. METHOD OF SOLUTION - 


5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - The program is restricted to just one enhanced tube type called Korodense LPD made by Wolverine Tube, Inc., and all program options have not been thoroughly tested.


6. TYPICAL RUNNING TIME - About 10 seconds on 386 type machine. 


7. UNUSUAL FEATURES OF THE PROGRAM - Interactive or file input; single or two-pass condenser designs; evaluation on a monthly basis; based on the Heat-Exchange Institute calculation methods; can input known fouling characteristics.


8. RELATED AND AUXILIARY PROGRAMS - SUBS.FOR file that contains all the subroutines: fluid properties, HEI material and gauge factors, temperature corrections, etc. INPUT.FOR interactive input file. IPBUG.FOR input file subroutine (file VALUES). OPUT.FOR output file subroutine (file RESULTS).


9. STATUS
ESTS0648/01: 06-APR-2001 Masterfiled Arrived


10. REFERENCES  - 
ESTS0648/01:
- T. Rabas et al.:
  Heat-Rate Improvements Obtained with the Use of Enhanced Tubes
  in Surface Condensers
  (1990 EPRI Conference)


11. MACHINE REQUIREMENTS - PC computer. 


12. PROGRAMMING LANGUAGE(S) USED -
ESTS0648/01: FORTRAN-77 


13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - MS-DOS. 


14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - A file called RESULT is used to store dumped data for each run. This file can be examined if the program crashes to determine the source of the problem. The WRITE (6,100) in the source code, HTRATE.FOR is used to write to this file. A file called VALUES is used for data input if the interactive mode is not selected. A sample input form is attached with the program documentation.


15. NAME AND ESTABLISHMENT OF AUTHORS - 
   T.J. Rabas 
   Argonne National Lab., IL (United States) 


16. MATERIAL AVAILABLE -
ESTS0648/01:
HTRATE.FOR Source file                     
HTRATE.EXE Executable file                 
INPUT.FOR Interactive input file           
IPBUG.FOR Input file subroutine (VALUES)   
OPUT.FOR Output file subroutine (RESULTS)  
RESULT File to store dumped data           
RESULTS Output file                        
VALUES Data input file                     
SUBS.FOR Contains all the subroutines      
HTRATE.OBJ Object program                  
SUBS.OBJ Object program                    
IPBUG.OBJ Object program                   
INPUT.OBJ Object program                   
OPUT.OBJ Object program                    
report                   Heat-Rate Improvements... (1990)           REPPT


17. CATEGORIES  - 

- H.  Heat Transfer and Fluid Flow


Keywords: CONDENSERS, HEAT TRANSFER, LIFE-CYCLE COST, OPERATING COST, POWER PLANTS, TUBES

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